CN100581310C - Illuminating switch and manufacturing method thereof - Google Patents

Illuminating switch and manufacturing method thereof Download PDF

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Publication number
CN100581310C
CN100581310C CN200710162043A CN200710162043A CN100581310C CN 100581310 C CN100581310 C CN 100581310C CN 200710162043 A CN200710162043 A CN 200710162043A CN 200710162043 A CN200710162043 A CN 200710162043A CN 100581310 C CN100581310 C CN 100581310C
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China
Prior art keywords
aforementioned
sheet material
layer
fluorophor
illuminating part
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CN101150899A (en
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中村光夫
重信广二
山田俊一
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Toshiba Materials Co Ltd
Sekonic Corp
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Toshiba Materials Co Ltd
Sekonic Corp
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H05B33/04—Sealing arrangements, e.g. against humidity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/002—Materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/016—Protection layer, e.g. for legend, anti-scratch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/046—Properties of the spacer
    • H01H2209/06—Properties of the spacer transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/068—Properties of the membrane
    • H01H2209/082—Properties of the membrane transparent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/002—Legends replaceable; adaptable
    • H01H2219/018—Electroluminescent panel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/046—Light emitting elements above switch site
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/052—Phosphorescence

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  • Push-Button Switches (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

A switch illuminating EL sheet (7) has a structure such that a transparent protection film (8), a transparent electrode layer (9), a light emitting layer (10), a dielectric layer (11) and a back electrode layer (12) are layered in order from a light emitting face side. The transparent protection film (8) has a thickness of 10 [mu]m to 60 [mu]m. Further, the transparent electrode layer (9) is constituted of a conductive polymer. Such an EL sheet (7) can suppress wire breakage or failure to light due to keystroke stress or the like without impairing reliability and clicking feeling of a key switch. The EL sheet (7) is arranged, for example, between a key top (1) and a switch mechanism portion (2) as a light source for illuminating the key top portion (1).

Description

The manufacture method of illuminated switch and illuminated switch
The application is that international application no is PCT/JP2005/002998, and international filing date is national applications the dividing an application for the Chinese patent application of " switch lighting is with the EL sheet material and used the illuminated switch and the electronic equipment of this sheet material " that number be 200580006196.4 title after the PCT international application on February 24th, 2005 enters China's stage.
Technical field
The switch lighting that the present invention relates to be used to switch lighting such as key switch is with the EL sheet material and used the illuminated switch and the electronic equipment of this sheet material.
Background technology
In the small-sized electric/electronic device that is equipped on mobile communication equipments such as mobile phone and PDA, CD Player, MD player, small tape recorder, remote control switch or automobile etc., carry out the illumination of the switch portion (key head (key top) part etc.) of key switch.Light source as the illuminated switch of the key head partial illumination of key switch generally adopts bulb or LED.
Illuminated switch is general adopt possess key head, metal key-press switch switching mechanism portions such as (metal dome switch), substrate and as the formation of the LED of light source.But in the mobile communication equipments such as mobile phone and PDA, the slimming of strong request key switch is so can't dispose LED under key head.Therefore, general structure is that LED is configured in the position that separates with key head and switching mechanism portion, makes the light diffusion from LED, from the key head part of throwing light on indirectly on every side.But lighting structure in the past is not by the illumination under the key head, thus exist to be difficult to enough brightness key head is partly thrown light on equably and structure on thicker problem.
At the problems referred to above, the light source that has proposed illuminated switch uses the technical scheme (for example, with reference to patent documentation 1,2) of the EL sheet material with electroluminescent (EL) element.The EL sheet material is the face light emitting source, and light weight is slim, and the degree of freedom height of shape is so have characteristics such as the high and power consumption of space availability ratio is little.Therefore, the EL sheet material can directly be configured between key head and the metal key-press switch.Used the illuminated switch of above-mentioned EL sheet material by this, can throw light under it key head.
As mentioned above, the EL sheet material is effective as the illumination light source of key switch.But, present inventor's etc. experiment and discussion result show, EL sheet material in the past exists owing to just can't light soon from the button stress of key head, the misoperation or the impaired such difficult point of button sense (sensation when pressing switch) of switch perhaps occur because of the rigidity of EL sheet material.
In the EL sheet material in the past, as evaporation on the polyester film more than the general used thickness 75 μ m of ELD or be coated with the film of ITO (tin indium oxide).The vapor-deposited film of ITO has high transmission rate and high conductivity, but also has the flexible shortcoming that causes easy broken string or sheet resistance to rise that causes because of mechanical stress or heat.Therefore, when the button stress of clear and definite key head caused the EL sheet material crooked, the ITO electrode can break, and resistance value can rise, and the situation of the broken string and the lamp that do not work easily takes place.Present inventor's etc. experiment shows, though can suppress the lamp that do not work of EL sheet material by the base material film of thickening ITO film to a certain extent, can diminish the reliability and the button sense of key switch in this case.
In addition, present inventor etc. inquires into the technology of using the transparent conductivity coating that is dispersed with transparent conductivity powder such as ITO in the insulative resin to make transparency electrode.When use ITO coating etc. forms transparent electrode layer, though can suppress the lamp that do not work of EL sheet material to a certain extent,, must carry out thick filmization and calcining for the low resistanceization of the resistance value that realizes transparency electrode, filming when dry like this will hardening, make curl more severe.Therefore, be difficult to use thin base material to make the EL sheet material.Even used under the situation of thin base material, owing to contain inorganic particles such as ITO, transparent electrode layer can hardening.Known these all are the reasons that causes button sense loss.In addition, under high humidity environment, also has the problem that is prone to stain on the EL sheet material during bright lamp.
Above-mentioned patent documentation 1 has been put down in writing in the position along the neighboring of the metal key-press switch of EL sheet material and has been formed otch, takes this to improve the technical scheme of button characteristic.In addition, the ELD that is formed with transparent electrode layer in patent documentation 2 on having put down in writing basement membrane is configured as arch, has formed the technical scheme of the illuminated switch of EL illuminating part in the switching manipulation portion of this arch.These technology have all been used the ITO vapor-deposited film at transparent electrode layer, so fail to solve problems such as broken string that the ITO vapor-deposited film causes and sheet resistance rising.
Patent documentation 1: the Japan Patent spy opens the 2002-56737 communique
Patent documentation 2: the Japan Patent spy opens the 2004-39280 communique
The announcement of invention
The purpose of this invention is to provide switch lighting EL sheet material, when this EL sheet material is used as the illumination light source of key switch etc., can not diminish the reliability and the button sense of key switch, can suppress the broken string that button stress etc. causes or the phenomenon of the lamp that do not work with good reproducibility.Another object of the present invention provides and can not diminish broken string that reliability and button sense, button stress etc. cause or the phenomenon of the lamp that do not work has obtained the illuminated switch that suppresses, and the electronic equipment that has used this illuminated switch.
Switch lighting of the present invention is the switch lighting EL sheet material with illuminating part pattern corresponding with switch with the EL sheet material; this EL sheet material is characterised in that; possess and have the luminescent layer that disperses to be contained in the EL fluorophor particle in the dielectric matrix; along the transparent electrode layer configuration of the light-emitting area of aforementioned light emission layer, that form by electric conductive polymer; be configured in transparent protective film on the aforementioned transparent electrode layer, that have the following thickness of the above 60 μ m of 10 μ m, and the dielectric layer and the backplate layer that dispose successively along the non-light-emitting area of aforementioned light emission layer.
Illuminated switch of the present invention is characterised in that to possess switch lighting of the present invention EL sheet material.Illuminated switch of the present invention for example possesses switching mechanism portion, makes the key head portion of portion of aforementioned switches mechanism action, the aforementioned switches illumination EL sheet material that is configured between portion of aforementioned switches mechanism and the previous key head and the previous key head is thrown light on.In addition, electronic equipment of the present invention is characterised in that to possess illuminated switch of the present invention.
The simple declaration of accompanying drawing
Fig. 1 is that the sectional view of the switch lighting of one of embodiments of the present invention with the configuration example of the illuminated switch of EL sheet material used in expression.
Fig. 2 is a plane graph of using the EL sheet material from the switch lighting of one of observed embodiments of the present invention of non-light-emitting area side (backplate side).
Fig. 3 is the sectional view along the A-A line of Fig. 2.
The best mode that carries out an invention
Below, embodiments of the present invention are described.Fig. 1 is that expression is the sectional view of general configuration of the illuminated switch of light source with the EL sheet material with the switch lighting of one of embodiments of the present invention.Fig. 2 is a plane graph of using the EL sheet material from the switch lighting of one of observed embodiments of the present invention of non-light-emitting area side (backplate side).Fig. 3 is the sectional view along the A-A line of Fig. 2.
Among Fig. 1,1 for having the key head portion of pushing with protuberance 2, the switching mechanism portion 3 that corresponding each key head portion 1 disposes the metal key-press type.Each switching mechanism portion 3 has the travelling contact 4 and the fixed contact 6 that is configured on the substrate 5 by of bonding.By pushing travelling contact 4 with pushing with protuberance 2 of key head portion 1, switching mechanism portion 3 is open/close to obtain the button sense simultaneously making.
Between above-mentioned key head portion 1 and switching mechanism portion 3, dispose switch lighting EL sheet material 7 as the light source that is used for key head portion 1 is thrown light on.As Fig. 1, Fig. 2 and shown in Figure 3, EL sheet material 7 possesses the structure that has stacked gradually transparent protective film 8, transparent electrode layer 9, luminescent layer 10, dielectric layer 11 and backplate layer 12 from the light-emitting area side.In other words, in emission side interarea (light-emitting area) the one laminated configuration of luminescent layer 10 its surface be formed with the transparent protective film 8 of transparent electrode layer 9.Transparent electrode layer 9 configuration that links to each other with luminescent layer 10.
In addition, at the non-emission side interarea (non-light-emitting area) of luminescent layer 10, for example stacked dielectric layer 11 that is formed with, this dielectric layer 11 is by at cyanethyl cellulose or contain in the organic polymer that fluorubber etc. has high-k and disperse to comprise TiO 2Or BaTiO 2Deng inorganic oxide powder and form with high radioactivity and high-k.In addition, across the stacked backplate layer 12 that is formed with of these dielectric layer 11 one.The stacked formation of one back side insulating barrier 13 as required again on the electrode layer 12 overleaf.By with back side insulating barrier 13 and the 7 integrated formation of EL sheet material, when can make switching mechanism portion 3 grades constitute between parts and the EL sheet material 7 electric insulation, can weaken the damage that the button stress of backplate layer 12 causes.
Switch lighting has the illuminating part pattern corresponding with key head portion 1 with EL sheet material 7.That is, each of EL sheet material 7 constitutes in the layer, and transparent electrode layer 9, luminescent layer 10 and dielectric layer 11 have the pattern corresponding shape with illuminating part 14.As shown in Figure 2, in the backplate layer 12, the electrode part 12a of the shape of corresponding each illuminating part 14 is integrally formed with the power supply distribution 12b that is connected these electrode part 12a.Backplate is connected with the 1st power supply terminal 15 with power supply distribution 12b.Have with the transparent electrode layer 9 of illuminating part 14 corresponding shape and is connected by power supply distribution 16, this transparency electrode is connected with the 2nd power supply terminal 17 with the distribution 16 of powering.As shown in Figure 1, transparency electrode is insulated layer 18 covering with the surface of power supply distribution 16.
Transparent electrode layer 9 is formed by the electric conductive polymer that possesses light transmission.As the concrete example of the electric conductive polymer that constitutes transparent electrode layer 9, can exemplify to be selected from polyacetylene, polyphenylene, polyphenylene vinylene, polyphenylene acetylene, polypyrrole, polythiophene, poly-Ethylenedioxy Thiophene, polyaniline etc. at least a kind is the polymer of principal component.The coating that will contain this electric conductive polymer is applied to showing of transparent protective film 8, makes its drying and formation transparent electrode layer 9.As filming of poly-Ethylenedioxy Thiophene (the PEDOT)-polystyrene acid (PSS) of the complex compound of electroconductive polymer, because its conductivity and light transmission are good, so be specially adapted to the formation of transparent electrode layer 9.
The transparent electrode layer 9 that is formed by above-mentioned electric conductive polymer is good for the durability of mechanical stress, so can significantly suppress the generation of the broken string that button stress causes or the lamp that do not work etc.But, to compare with the ITO film of the transparency electrode that is used for EL sheet material in the past (for example, sheet resistance 300 Ω/, light transmittance is more than 85%), its conductivity and light transmittance might not be enough.Electric conductive polymer is used under the situation of transparent electrode layer 9, though can be by subtracting the thick light transmittance that improves, such words can descend for the reliability of the film destroy that button stress causes, and easily causes the part increase of conductivity etc.
Therefore, in order to improve the reliability of switch lighting with EL sheet material 7, the average thickness of transparent electrode layer 9 is more fortunately more than the 0.1 μ m, and sheet resistance is 1000 Ω/below the more fortunately.The average thickness of transparent electrode layer 9 is more preferably more than 1 μ m.For the reliability of harmless key switch and button sense etc., the average thickness of transparent electrode layer 9 is preferably in below the 5 μ m.
If the average thickness of transparent electrode layer 9 increases, then for example light transmittance can be lower than 80%.The decline of the light transmittance of transparent electrode layer 9 can cause the luminosity of EL sheet material 7 to descend.Therefore, as described later, preferably be used in combination with luminescent layer 10 with EL fluorophor (EL material) of high brightness.Be used in combination by the transparent electrode layer 9 that will form by electric conductive polymer and the EL fluorophor of high brightness, can obtain good key switch illumination brightness.Specifically, under the drive condition of voltage 100V, frequency 400Hz, can realize 50cd/m 2Above brightness.Take this to avoid the maximization of driving power and the short lifeization that power output rises and causes, and the problem that occurs can't obtain such actual use of practical brightness the time.
Transparent protective film 8 as the formation base material of transparent electrode layer 9 can use the good widely used polymeric membrane of mechanical strength, for example the monomer film or the laminated film of polyethylene terephthalate (PET), polyether sulfone (PES), polyimides, nylon, fluorine resin, Merlon, polyurethane rubber etc.Here, the thickness of transparent protective film 8 is extremely important for the flexibility that obtains simultaneously to impact to the durability of button stress with to button sense etc.Specifically, the thickness of transparent protective film 8 is more than 10 μ m in the scope below the 60 μ m.If the thickness of transparent protective film 8 less than 10 μ m, then can't suppress the broken string or the lamp phenomenon that do not work that button stress causes with good reproducibility.On the other hand, if the thickness of transparent protective film 8 surpasses 60 μ m, then diminish the button sense.
Present inventor's etc. experimental result shows, used under the situation of PET film of thickness 9 μ m, and the button stress that is less than 1,000,000 times also is easy to film is broken.This is the reason that causes spot defect etc.Relatively, used under the situation of PET film of thickness 12 μ m,,, also can give full play to function when being used for the key switch illumination even touch potential surpasses 1,000,000 times though small defective can take place.Thickness is the PET film of 25 μ m, even touch potential surpasses 1,500,000 times, film can not break yet.On the other hand, if transparent protective film 8 is blocked up, then rigidity increases, and is impaired as the button sense meeting of key switch.The PET film of thick 63 μ m can't obtain enough button senses.Therefore, the thickness of transparent protective film 8 is preferably below the above 60 μ m of 10 μ m, more preferably below the above 40 μ m of 20 μ m.
Applied in above-mentioned transparent protective film 8 by the transparent electrode layer 9 that electric conductive polymer forms with the form of coating.At this moment, consider dimensional accuracy and the warpage of the contraction generation of filming and operation etc., the thickness of coated substrate is preferably more than the 50 μ m.Corresponding to this point, for example can obtain the good thin EL sheet material of button sense in accordance with the following methods.That is, printing forms the hyaline membrane with release property on thick base material film, coating composition change thereon electric conductive polymer, form transparent electrode layer, the layer that forms other again makes the EL sheet material.Then, peel off base material film.But so easily break, there is the problem of durability and practicality owing to formed by thin resin coating in EL sheet material obtained by this method.All can't obtain enough bond strengths when in addition, engaging key head and switch parts etc. or when forming colour filter.
Therefore, preferably will use as coated substrate across the material that little adhesive layer forms fitting thick base material film (for example, more than the thickness 50 μ m) on the transparent protective film 8 below the thick 60 μ m.By using as coated substrate by the applying film, can adopt EL manufacturing process equipment in the past.Like this with regard to can not need because of using film complicated production technology and film with printing equipment, drying machine, transport the equipment of high price such as equipment, therefore can suppress the increase that switch lighting is used the manufacturing cost of EL sheet material 7.After the manufacturing of EL sheet material 7, peel off base material film and can prevent loss of button sense etc.
In addition, with the operation of parts such as key head or switch assembling in, thickness is difficult to handle less than the EL sheet material of 50 μ m, efficient is poor, so be unfavorable for volume production.The button sense can be not impaired prerequisite under, with the state that is attached with little adhesive substrate film it is dropped into assembling procedure, can provide easy realization incorporate technology.In addition, transparent protective film 8 itself also can be the formation of the lamination thing of the base material more than 2 layers.By the transparent protective film 8 that uses such lamination thing by the base material more than 2 layers to form, adhesive linkage and multiple base material play the effect that impacts resilient coating, so can further improve anti-impacting property.
When transparent protective film 8 was made of the lamination thing of the base material more than 2 layers, each base material was not limited to macromolecular material.For example, can use and on above-mentioned polymeric membrane, formed silica (SiO x), aluminium oxide (AlO x), titanium oxide (TiO x) wait metal oxide layer or silicon nitride (SiN x), the laminated film of aluminium nitride metal nitride layer such as (AlN).Metal oxide layer or metal nitride layer play the effect of damp course.Therefore, have the transparent protective film 8 of this layer, can improve the reliability of the transparent electrode layer 9 that the lower electric conductive polymer of high humidity environment adaptability forms by use.
Form the electric conductive polymer of transparent electrode layer 9 and polyester etc. resin molding engaging force a little less than, the phenomenon that button stress causes film to peel off may appear.At this point, on transparent protective film 8, form easy adhesive linkage to improve the transparent electrode layer 9 that forms by electric conductive polymer and the bond strength of transparent protective film 8.Therefore, can prevent that the film that button stress causes from peeling off, further improve reliability.Under the situation of giving pigment filter membrane etc. in order to change illuminant colour, also can obtain same effect.In addition, by implementing easy joining process on the two sides of transparent protective film 8 in advance, even carry out also can being improved by film-strength under the situation of filter membrane printing etc., need not to worry the difference of treated side, productivity improves.
The luminescent layer 10 that forms on the transparent protective film 8 with transparent electrode layer 9 contains the EL fluorophor particle as the electroluminescent source.The EL fluorophor particle preferably adopts the coloured light that for example turns blue to work in copper zinc sulphide (ZnS:Cu) fluorophor of bluish-green coloured light or also contain the work in copper zinc sulphide as the chlorine of flux of trace (ZnS:Cu, Cl) ZnS such as fluorophor is a fluorophor.Such EL fluorophor particle for example by decentralized configuration in cyanethyl cellulose or contain in the dielectric matrix that the such high-molecular organic material with high-k of fluorubber forms.That is, luminescent layer 10 is organic dispersed luminescent coatings that decentralized configuration has the EL fluorophor particle that is formed by inorganic material in the dielectric matrix that is formed by organic material.
But, constitute the EL fluorophor particle of luminescent layer 10, specifically be that the ZnS:Cu fluorophor particle exists not water-fast defective that promptly airborne moisture makes its characteristic (brightness etc.) deterioration easily.Therefore, luminescent layer 10 preferably adopts the EL fluorophor particle that is covered by transparent damp proof tunicle in fact, promptly so-called EL fluorophor particle with damp proof tunicle.Damp proof tunicle as the EL fluorophor particle for example adopts metal oxide film or metal nitride film.Kind to metal oxide film is not particularly limited, but considers from aspects such as moisture resistance, light transmission and insulating properties, preferably adopts at least a kind that is selected from silica, titanium oxide, aluminium oxide.In addition, metal nitride film can exemplify silicon nitride or aluminium nitride etc.
From considerations such as the homogeneity of film or manufacturing costs, preferably adopt chemical vapor deposition method (CVD method) to form by metal oxide film or the film formed damp proof tunicle of nitride metal.The film of powder surface of particularly considering deterioration in brightness, the flow regime of the EL fluorophor that heat causes forms property and the environmental safety when producing in a large number etc., preferably use and can not explode or not have combustible material, and utilize the reactive high reaction system under the low temperature (below 200 ℃).As such reaction system, can exemplify SiCl 4+ 2H 2O → SiO 2+ 4HCl, TiCl 4+ 2H 2O → TiO 2+ 4HCl etc.The average film thickness of damp proof tunicle is preferably in the following scope of the above 2 μ m of 0.1 μ m.
The deterioration that the moisture of EL fluorophor causes also can prevent by covering whole EL sheet material 7 with moisture barrier films (polychlorostyrene tetrafluoroethylene etc.).But, can make EL sheet material 7 whole thickenings like this, diminish the reliability and the button sense of key switch.Corresponding to this, by the EL fluorophor particle of use with damp proof tunicle, the characteristic that need not to adopt moisture barrier films or hygroscopic mem-brane just can suppress the EL fluorophor that moisture causes descends.That is, the luminescent layer 10 of the EL fluorophor particle by will containing the anti-warm tunicle of band is used for switch lighting with EL sheet material 7, can suppress the characteristic decline of the EL fluorophor that moisture causes under the prerequisite of the integral thickness that does not increase EL sheet material 7.
In addition, the decline for the light transmittance that remedies as previously mentioned the transparent electrode layer 9 that is formed by electric conductive polymer is preferably in the EL fluorophor that luminescent layer 10 uses high brightness.That is, best combination is used electric conductive polymer transparent electrode layer 9 that forms and the luminescent layer 10 that contains high brightness EL fluorophor particle.Here, ZnS is that the EL fluorophor generally makes by calcining phosphor raw material under the condition of fully growing up in the zinc sulphide crystallization of work in copperization.Such ZnS is that the average grain diameter of EL fluorophor particle is about 25～35 μ m.The formability of the EL fluorophor that has used this method when constituting EL sheet material 7, flexibility, anti-impacting property, brightness etc. are difficult to reach desired level.
On the other hand, No. 5643496 communique of United States Patent (USP) put down in writing the EL fluorophor that is formed by the ZnS:Cu fluorophor below the average grain diameter 23 μ m.This small-particle EL fluorophor need not to implement to sieve such operation, just can obtain by create conditions (calcination condition etc.) of controlling the EL fluorophor.Put down in writing little granulation by the EL fluorophor in the above-mentioned communique and improved the brightness of EL element of having used this small-particle etc. and the technical scheme of life characteristic.But, use this EL sheet material of only controlling the small-particle EL fluorophor formation of creating conditions and obtaining not necessarily can obtain enough brightness.This may be to descend because only controlled itself light characteristic of the small-particle EL fluorophor of creating conditions.
Therefore, preferably the fluorophor particle that makes is carried out progressive operation etc. under the calcination condition of routine, adopt the EL fluorophor particle of having removed thick fluorophor particle.Specifically, preferably use by progressive operation etc. and removed thick fluorophor particle (corase particles composition), with the average grain diameter of 50%D value representation below the 23 μ m more than the 10 μ m and have particle diameter reaches the particle size distribution below the 30 quality % in the components in proportions more than the 25.4 μ m an EL fluorophor powder.If adopt EL fluorophor with such average grain diameter and particle size distribution, the EL fluorophor particle number of the unit volume in the luminescent layer 10 is increased, so not only can improve the granularity of luminescent layer 10, formability, flexibility, anti-the impacting property of EL sheet material 7 are increased.
If the average grain diameter of EL fluorophor particle less than 10 μ m, then may cause the luminosity of EL fluorophor particle itself to descend.On the other hand, if the average grain diameter of EL fluorophor particle surpasses 23 μ m, the EL fluorophor particle decreased number of the unit volume in the luminescent layer 10 then, the brightness of luminescent layer 10 may descend.The situation that the above components in proportions of particle diameter 25.4 μ m surpasses 30 quality % also is like this.The average grain diameter of EL fluorophor particle is more preferably more than 13 μ m in the scope below the 20 μ m.In addition, the above components in proportions of the 25.4 μ m of the particle diameter in the EL fluorophor particle is more preferably below 15 quality %.When the high brightness EL fluorophor that satisfies above-mentioned condition is made EL element in the transparency electrode of using light transmittance for example more than 85%, sheet resistance 500 Ω/below the, under the drive condition of voltage 100V, frequency 400Hz, has 80cd/m 2Above brightness.
In addition, used under the situation of thin transparent protective film 8, transparent electrode layer 9 that the bight damage electric conductive polymer of thick fluorophor particle forms and transparent protective film 8 may occur and form the phenomenon of spot defect.In addition, if the current density when high humidity environment drives down is higher, electric conductive polymer deterioration at short notice sometimes then.Thick fluorophor particle easily causes concentrating of electric field at the position that contacts with electric conductive polymer, may cause the deterioration of electric conductive polymer or therefore produce stain.Based on above-mentioned situation, preferably use average grain diameter at the EL fluorophor of component ratio below 30 quality % below the 23 μ m and more than the particle diameter 25.4 μ m.
With sputtering ZnS: when the EL fluorophor particle that the Cu fluorophor forms was used for luminescent layer 10, common illuminant colour be that blueness is to blue-green.In order to change this illuminant colour, can in luminescent layer 10, add pigment such as organic fluorescent pigment.But if add pigment with high concentration in the luminescent layer 10, then hydroscopicity can uprise, and the resistance value of the transparent electrode layer 9 that is formed by electric conductive polymer under hot and humid environment easily rises.Therefore, be preferably in the one or both sides formation coat of colo(u)r of transparent protective film 8.Adopt this formation, can be effectively and under high reliability, change the illuminant colour of luminescent layer 10.
Except the purpose of the illuminant colour that changes luminescent layer 10, for example also can form coat of colo(u)r as the light diffusion layer that changes the outward appearance look.For example, form light diffusion layer, can cover the transparent electrode layer 9 of electric conductive polymer formation and the crawling of luminescent layer 10 with Chinese white.Electric conductive polymer painted strong is because of screen printing etc. is prone to crawling.In addition, luminescent layer 10 preferential filmings make under the density of phosphor under the degradation situation, occur the phenomenon of luminance nonuniformity sometimes.Light diffusion layer can be alleviated above-mentioned influence, helps the raising of outward appearance and quality.
Coat of colo(u)r is also configurable between transparent electrode layer 9 and luminescent layer 10.Adopt under the situation of this formation, be preferably in to be coated on the transparent protective film 8 with transparent electrode layer 9 and sneaked into the coating of pigment in the high adhesive of cementability and form coat of colo(u)r.Such coat of colo(u)r not only has the effect that changes illuminant colour and outward appearance look, also can obtain to improve the effect of the cementability of transparent protective film 8 with transparent electrode layer 9 and luminescent layer 10.
When forming above-mentioned coat of colo(u)r, for the print pass of coating of pigment that reduced general adding, in most cases the solid constituent of pigment all surpasses 50% than (mass ratio).If use the high coating of pigment ratio, then easily moisture absorption causes the decline of the resistance value of electric conductive polymer sometimes.In addition, if the ratio of pigment is higher, then form relatively poor membranous of the flatness of porous matter, so the sheet resistance of the transparent electrode layer 9 that printing thereon forms for example may rise to 2000 Ω/more than the, and can realize the sheet resistance of 1000 Ω/below the when on level and smooth film, forming with 200 sieve mesh printings.Therefore, the most handy pigment ratio of coat of colo(u)r (mass ratio of solid constituent) in the adding below 50% coating of pigment form.Even with the substrate of coat of colo(u)r, also can suppress the rising of the resistance value of transparent electrode layer 9 like this as transparent electrode layer 9.
Used in the EL sheet material 7 of above-mentioned EL fluorophor particle with damp proof tunicle, formed backplate layer 12 by carbon dust such as metal dust, powdered graphites such as coating Ag powder or Cu powder or their mixed-powder etc.Promptly; coating forms luminescent layer 10 on the transparent protective film 8 with transparent electrode layer 9; again after coating forms dielectric layer 11 and backplate layer 12 successively on this luminescent layer 10, by thermo-compressed etc. with the integrated switch lighting that makes of this laminate with EL sheet material 7.In addition, when forming back side insulating barrier 13 on the electrode layer 12 overleaf, be preferably in the same coating formation operation and be coated with formation back side insulating barrier 13 on the electrode layer 12 overleaf.
With the formation beyond each formation layer of EL sheet material 7, can adopt the formation same about such switch lighting with common EL sheet material.In addition, have power supply distribution 16 with each transparent electrode layer 9 of illuminating part 14 corresponding shape, be preferably formed as the distribution more than 2 covers about the power supply distribution 12b that connects each electrode part 12a corresponding and connection with the shape of the illuminating part 14 of backplate layer 12.Backplate shown in Figure 2 all has 2 cover distributions with power supply distribution 12b and transparency electrode with power supply distribution 16.Adopt such formation, though because of be shaped, that button causes is crooked or impact that resistance value that stress etc. causes 1 cover in 2 covers rises or broken string etc., also can suppress the lamp phenomenon that do not work of EL sheet material 7.Take this further to improve the reliability of switch lighting with EL sheet material 7.In addition, have under the situation of the illuminating part pattern more than 2 independently, also can utilize the above distribution of 2 covers to make the bright independently lamp of each illuminating part.
In addition, for switch lighting is increased with the button durability of EL sheet material 7 etc., also can be and at least one side's at the back side the position configuration corresponding pad of the softness of formation such as the polyurethane resin of thickness below 50 μ m more than the 2 μ m for example with illuminating part 14 central authorities on the surface of EL sheet material 7.By disposing this pad, the absorption efficiency of button stress etc. increases, so can further improve the reliability of switch lighting with EL sheet material 7.The allocation position of pad can be between transparent protective film 8 and transparent electrode layer 9, also overleaf between electrode layer 12 and the back side insulating barrier 13, can be configured in any one position wherein, also can dispose simultaneously two positions.
The switch lighting of above-mentioned execution mode is with in the EL sheet material 7, when transparent electrode layer 9 uses durability good electrical conductivity polymer to button stress etc., uses all good transparent protective films 8 of flexibility and anti-button characteristic.Therefore, can provide the button durability good and the reliability of switch and the switch lighting EL sheet material 7 that the button sensitivity can be not impaired.In addition, by being used in combination electric conductive polymer transparent electrode layer 9 that forms and the luminescent layer 10 that contains the EL fluorophor particle of high brightness, can remedy the decline of the light transmittance of transparent electrode layer 9, so can fully keep the light characteristic of EL sheet material 7.Specifically, under situation about having used, can under the drive condition of voltage 100V, frequency 400Hz, obtain 50cd/m with the EL fluorophor particle of damp proof tunicle 2Above brightness.
Such switch lighting can throw light on to key head 1 with enough brightness under key head 1 equably with EL sheet material 7, and can significantly improve the durability and the reliability of illuminated switch.The switch lighting of this execution mode is suitably used as the light source of the illuminated switch of key head portion 1 and 3 combinations of portion of metal key-press type mechanism with EL sheet material 7.Used switch lighting for example to be applicable to that with the illuminated switch of EL sheet material 7 slimming to key switch has mobile communication equipments such as the mobile phone of high request or PDA etc.
As the electronic equipment of embodiments of the present invention, can exemplify to possess and use switch lighting with mobile communication equipments such as the mobile phone of the illuminated switch of EL sheet material 7 or PDA.In addition, switch lighting of the present invention not merely is the illuminated switch with portion of metal key-press type mechanism with the scope of application of EL sheet material, and it can be used under the switch portion such as key head its various illuminated switch that throws light on.In addition, the equipment that is suitable for so illuminated switch also is not limited only to electronic equipments such as mobile communication equipment, can be used for various electric/electronic devices.
Below, specific embodiments of the invention and evaluation result thereof are described.
Embodiment 1
At first, making ZnS according to following operation is the EL fluorophor.Promptly, the pure water that in the zinc sulfide powder of about 1～3 μ m of 100g particle diameter, adds 1 liter, form paste-like, add 0.25g copper sulphate (5 hydrate) then therein and, fully mix as 40g magnesium chloride, 40g barium chloride and the 20g sodium chloride of crystalline growth agent (flux).After making this paste-like mixture drying, in its silica crucible of packing into, under 1150 ℃ temperature, carry out 4 hours calcining in the air.
Then, above-mentioned calcined material implemented washing and dried after, in the 300g calcined material, sneak into 15g zinc oxide, this mixture is packed in the silica crucible, in the air in 750 ℃ temperature lower calcination 1.5 hours.This calcined material is scattered in the water washing 3 times.Then, carry out the salt acid elution under the condition of pH=1.5 and adopt the neutralization washing of pure water, refilter, drying, sieve acquisition ZnS:Cu fluorophor (EL fluorophor) with the sieve of 325 sieve meshes.The chlorine that contains trace in this fluorophor as flux.
With grain size analysis meter (BECKMAN COULTER corporate system, trade name: the particle size distribution of the above ZnS:Cu fluorophor that obtains of mensuration Multisizer M3).It the results are shown in table 1.Try to achieve the 50%D value as average grain diameter by the measurement result of this particle size distribution, the 50%D value of ZnS:Cu fluorophor powder is 26.3 μ m.In addition, the above corase particles components in proportions of particle diameter 25.4 μ m is 54.5 quality %.Show the particle size distribution of the ZnS:Cu fluorophor that embodiment 3 described later makes in the table 1 simultaneously.
Table 1
Figure C20071016204300151
In sputtering ZnS: the surface of Cu fluorophor particle is formed for the oxidation titanium film of anti-wet process, forms silicon oxide film again.Use this ZnS:Cu fluorophor particle, make switch lighting EL sheet material according to following operation with damp proof tunicle.At first, preparation is as PET film (Dongli Ltd.'s system, the trade name: Le ミ ラ-S10), fit with base material film (the リ Application テ of little adhesive layer thereon of the thick 12 μ m of transparent protective film ッThe Network corporate system, trade name: PT125, thickness: 140 μ m (containing little adhesive layer)), as coated substrate.On the transparent protective film of this coated substrate (applying base material), be coated with transparent conductivity polymer (AGFA corporate system, trade name: P3040), make its drying by screen printing.So just formed the transparent electrode layer of thick 2～4 μ m, sheet resistance 500～800 Ω/, light transmittance 60～70%.
Then, sneak into EL with adhesive coating (E.I.Du Pont Company system, trade name: 7155N), modulate EL fluorophor coating with the ratio of 1.5 times of amounts of adhesive mass ratio above-mentioned in the ZnS:Cu fluorophor of damp proof tunicle.By screen printing this EL fluorophor coating is coated on the transparent protective film with above-mentioned transparent electrode layer, made its drying, form luminescent layer (luminescent coating).On this luminescent layer, be coated with EL dielectric coating (E.I.Du Pont Company's system, trade name: 7153N), make its drying, form dielectric layer by screen printing.Then, by screen printing coating conductive paste (E.I.Du Pont Company's system, trade name: carbon paste7152), make its drying, form the backplate layer.At last, coating coatings (E.I.Du Pont Company's system, trade name: UV CURE INK 5018), make its drying, make switch lighting EL sheet material.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 2
Same with the foregoing description 1, at first making the 50%D value is the ZnS:Cu fluorophor of 26.3 μ m.Sieve with 500 sieve meshes sieves this fluorophor powder again, obtains the EL fluorophor as object.Similarly to Example 1, measure the particle size distribution of this EL fluorophor (ZnS:Cu fluorophor).Obtain the 50%D value as average grain diameter by the measurement result of this particle size distribution, the 50%D value is 22.9 μ m.In addition, the ratio of the distribution of the corase particles more than the particle diameter 25.4 μ m is 29.6 quality %.Except using this EL fluorophor (ZnS:Cu fluorophor), other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 3
Same with the foregoing description 1, at first making the 50%D value is the ZnS:Cu fluorophor of 26.3 μ m.Sieve with 635 sieve meshes sieves this fluorophor powder again, obtains the EL fluorophor as object.Similarly to Example 1, measure the particle size distribution of this EL fluorophor (ZnS:Cu fluorophor).The measurement result of particle size distribution is as shown in table 1.Obtain the 50%D value as average grain diameter by the measurement result of this particle size distribution, the 50%D value is 19.3 μ m.In addition, the above corase particles components in proportions of particle diameter 25.4 μ m is 14.4 quality %.Except using this EL fluorophor (ZnS:Cu fluorophor), other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 4
Same with the foregoing description 1, at first making the 50%D value is the ZnS:Cu fluorophor of 21.5 μ m.Sieve with 635 sieve meshes sieves this fluorophor powder again, obtains the EL fluorophor as object.Similarly to Example 1, measure the particle size distribution of this EL fluorophor (ZnS:Cu fluorophor).Obtain the 50%D value as average grain diameter by the measurement result of this particle size distribution, the 50%D value is 13.2 μ m.In addition, the ratio of the distribution of the corase particles more than the particle diameter 25.4 μ m is 3.6 quality %.Except using this EL fluorophor (ZnS:Cu fluorophor), other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 5
According to the condition of the embodiment record of special No. 5643496 communiques of aforesaid U.S. Patent, make small-particle EL fluorophor (ZnS:Cu fluorophor).This small-particle EL fluorophor is to its enforcement screening but by controlling the EL fluorophor that calcination condition obtains.Calcination condition is that the 1st calcining is 1160 ℃ * 3.7 hours, and the 2nd time calcining heat is 730 ℃.The average grain diameter (50%D value) of this small-particle EL fluorophor is 23 μ m, and the above corase particles components in proportions of particle diameter 25.4 μ m is 36 quality %.Except using this EL fluorophor (ZnS:Cu fluorophor), other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 6
Except the PET film with thick 24 μ m is used for transparent protective film and uses the EL fluorophor (ZnS:Cu fluorophor) that the foregoing description 3 makes, other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 7
Except the PET film with thick 50 μ m is used for transparent protective film and uses the EL fluorophor (ZnS:Cu fluorophor) that the foregoing description 3 makes, other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 8
Except the coating thickness of electric conductive polymer less than 1 μ m and use the EL fluorophor (ZnS:Cu fluorophor) that the foregoing description 3 makes, other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 9
Except the power supply distribution of backplate and transparency electrode adopted 2 covers, other and the foregoing description 6 were same, make switch lighting EL sheet material.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 10
At first, the PET film of thick 24 μ m of having implemented easy bonding processing as transparent protective film, is fitted thereon with the base material film (the PET films of thick 125 μ m) of little adhesive layer, form coated substrate.On the other hand, in 100 mass parts pigment filter membranes paint adhesive (printing ink Co., Ltd. of kingdom system, trade name: 000 メ ジ ュSystem) adds 22 mass parts fluorescent pigments (シ Application ロ イ ヒ corporate system, trade name: FA005), stir, disperse, modulate pigment filter membrane coating in.By screen printing this pigment filter membrane is coated on the transparent protective film of coated substrate (applying base material) with coating, made its drying, form the pigment filter membranous layer.
On above-mentioned pigment filtering layer, be coated with transparent conductivity polymer (AGFA corporate system, trade name: P3040), make its drying by screen printing.Form the transparent electrode layer of thick 2～4 μ m, sheet resistance 500～800 Ω/, light transmittance 60～70%.Except using this transparent protective film with pigment filtering layer and transparent electrode layer, use EL fluorophor (ZnS:Cu fluorophor) that embodiment 3 makes in addition simultaneously, other makes switch lighting EL sheet material similarly to Example 1.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 11
Except the pad below the configuration diameter 6mm on the transparent protective film of EL sheet surface, more than the thick 2 μ m below the 50 μ m, other makes switch lighting EL sheet material similarly to Example 1.Pad is configured in the core of the illuminating part pattern corresponding with switch respectively.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Embodiment 12
Transparent protective film (relief printing plate corporate system, trade name: the GX film) go up the base material film (the PET films of thick 125 μ m) of fitting, form coated substrate at the thick 12 μ m that implemented anti-wet process with little adhesive layer.Except using this coated substrate, other makes switch lighting EL sheet material similarly to Example 3.Back side insulating barrier by with hot-rolling to (the relief printing plate corporate system, trade name: (Polychemical of Mitsui Du Pont corporate system, trade name: material EEA) carries out lamination, applying and forms to be coated with PUR the GX film) at the diaphragm of thick 12 μ m.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Comparative example 1
Except transparent protective film used the PET film of thick 9 μ m, other made switch lighting EL sheet material similarly to Example 3.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Comparative example 2
Except transparent protective film used the PET film of thick 63 μ m, other made switch lighting EL sheet material similarly to Example 3.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
Comparative example 3
At first, evaporation ITO (tin indium oxide) makes ELD on the polyester film of thick 75 μ m.Below 0.1 μ m, sheet resistance is about 300 Ω/ by the thickness of the film formed transparent electrode layer of ITO evaporation, and light transmittance is more than 85%.Except using this ELD (ITO film), other makes switch lighting EL sheet material similarly to Example 3.This switch lighting is used for evaluating characteristics described later with the EL sheet material.
The switch lighting of the foregoing description 1～12 and comparative example 1～3 is estimated with initial stage brightness, button sense, the following mensuration of button durability of EL sheet material.Table 2 is depicted as the formation of each EL sheet material, and table 3 is depicted as the evaluating characteristics result of each EL sheet material.The following enforcement of the mensuration of film class thickness and coating thickness.On the supporting station vertical, electronics numerical value display (ミ Star ト ヨ Co., Ltd. system is set with SUS system mensuration platform, trade name: ID-c112B), with sample to be determined flatly be statically placed in measure platform after, will measure son and be lowered into the mensuration platform quietly, carry out determining film thickness 5 times as the mensuration initial point.For film class thickness, 3 times mean value having removed maximum and minimum value is decided to be measured value.For coating thickness, each measured value represents that with scope average coating thickness and film class thickness are measured equally.
The initial stage brightness of EL sheet material is measured in accordance with the following methods.That is, the EL sheet material is lighted in the dark place below normal temperature, normal wet 10lux under the condition of voltage 100V, frequency 400Hz, is the brightness of CS-100 mensuration with ミ ノ Le タ corporate system color colourity after 1 minute, with this as initial stage brightness.The button durability is estimated in accordance with the following methods.Promptly, use the ABS resin rod of the diameter 1.5mm that the edge handled with R0.1, central authorities to illuminating part under 3N, 180 times/minute condition impact test, impact repeatedly test until impacted to break in the position or luminous appearance unusual till, impact number of times evaluation according to this moment.
The button sense is estimated in accordance with the following methods.That is, the central authorities of the mensuration of diameter 1.5mm and specific metal key-press are contacted vertical when increasing the weight of to produce the button sense, when pressing to experience and the complexity of the button sense of touch during loose key estimate as the benchmark of button sense.Similarly respond to the variation of the button sense when the EL plate is carried on metal key-press, estimate by light order according to deterioration condition, promptly to weight, ◎: button sense no change, zero: the button sense does not have significant change, △: the button sense is heavy, feel deterioration, *: button sense deterioration, can't experience.
Table 2
Figure C20071016204300201
*: give damp course.
Table 3
Figure C20071016204300202
Can obviously find out from table 3,, impact that breaking has appearred in transparent protective film in the test below 1,000,000 times though used thickness good less than the comparative example 1 button sense of the transparent protective film of 10 μ m.Consider button sense and actual installation space, require illuminating part as thin as a wafer, but thickness easily breaks less than the transparent protective film of 10 μ m, can't satisfy requirement for anti-impacting property.Used thickness to surpass the comparative example 2 of the transparent protective film of 60 μ m, though can guarantee the durability more than 3,000,000 times in impacting test, the button sense is low, can't be used for actual use.Used the EL sheet material of the comparative example 3 of ITO electrode to show 100cd/m 2High brightness, but can't obtain necessary button sense of switch and button durability.
With respect to this, the button sense of the EL sheet material of embodiment 1～12 is all fine, and can obtain the durability more than 1,000,000 times in impacting test.That is, the button sense of the EL sheet material of embodiment 1 is good, though in the test of 1,000,000 times button at the visible fine non-illuminating part of stain shape of button part, see not obviously in appearance from practicality, can obtain the light of homogeneous when being used for the illumination of key switch.In addition, removed thick fluorophor particle by screening, when average grain diameter was controlled at the scope of 10～23 μ m, the brightness ratio embodiment 1 of the EL sheet material of the embodiment 2～4,6～9 of corase particles components in proportions below 30 quality % that particle diameter 25.4 μ m are above was higher.
In addition, the power supply distribution is that the button reliability of embodiment 9 of 2 covers has further raising.Embodiment 10 slightly descends brightness because of there being coat of colo(u)r, but coat of colo(u)r is improved practical characteristic.Embodiment 11 utilizes pad further to improve the button reliability.Under 40 ℃, the environment of 95%RH, carried out bright lantern test with the EL sheet material to embodiment 12 under the drive condition of half-wave 200Vp-p, 600Hz.In such test, electric conductive polymer decomposed about 2 hours usually, caused the lamp that do not work, and with respect to this, the normal bright lamp of the EL sheet material of embodiment 12 confirmed that it shows the long life under hot and humid environment more than 6 hours.
The possibility of utilizing on the industry
When switch lighting of the present invention uses as the illumination light source of key switch etc. with the EL sheet material, open at harmless key Under the reliability of closing etc. and the prerequisite of button sense, repeatability that can be good suppress broken string that button stress etc. causes or The lamp phenomenon does not work. Therefore, switch lighting of the present invention uses with the light source that the EL sheet material can be used as illuminated switch. In addition, illuminated switch of the present invention can be realized slimming, and its reliability and button sense etc. are good simultaneously. Therefore, Illuminated switch of the present invention can be used for various electric/electronic devices.

Claims (10)

1. illuminated switch; it is characterized in that; possesses a plurality of switching mechanism portion; make a plurality of key head portion of aforementioned a plurality of switching mechanism portion action; be configured between aforementioned a plurality of switching mechanism portion and the aforementioned a plurality of key head portion; and EL sheet material with illuminating part pattern corresponding with aforementioned a plurality of key head portion; aforementioned EL sheet material possesses: have the EL fluorophor particle that disperses to be contained in the dielectric matrix; and has luminescent layer with aforementioned illuminating part pattern corresponding shape; along the configuration of the light-emitting area of aforementioned light emission layer; form by electric conductive polymer; and has transparent electrode layer with aforementioned illuminating part pattern corresponding shape; connect have with the transparency electrode of the aforementioned transparent electrode layer of aforementioned illuminating part pattern corresponding shape with the power supply distribution; be configured on the aforementioned transparent electrode layer; transparent protective film with the following thickness of the above 60 μ m of 10 μ m; along the non-light-emitting area configuration of aforementioned light emission layer; has dielectric layer with aforementioned illuminating part pattern corresponding shape; in the non-light-emitting area side of aforementioned light emission layer across the configuration of aforementioned electric dielectric layer; have a plurality of electrode part corresponding and the backplate layer of the power supply distribution that is connected aforementioned a plurality of electrode part with aforementioned illuminating part pattern; be disposed at the back side insulating barrier on the aforementioned backplate layer; the 1st power supply terminal that connects the aforementioned power supply distribution of aforementioned backplate layer; and the 2nd power supply terminal that connects aforementioned transparency electrode usefulness power supply distribution
The aforementioned power supply distribution of aforementioned backplate layer has the above distribution of 2 covers that land used is connected with the 1st power supply terminal respectively, and aforementioned transparency electrode has the above distribution of 2 covers that land used is connected with the 2nd power supply terminal respectively with the power supply distribution.
2. illuminated switch as claimed in claim 1 is characterized in that, portion of aforementioned switches mechanism has the travelling contact and the fixed contact that is configured on the substrate by of bonding.
3. illuminated switch as claimed in claim 1 is characterized in that, the pad of the softness that the surface of aforementioned EL sheet material and at least one side's at the back side the position configuration polyurethane resin corresponding with illuminating part central authorities forms.
4. illuminated switch as claimed in claim 1 is characterized in that, aforementioned EL fluorophor particle is that the EL fluorophor forms by ZnS.
5. illuminated switch as claimed in claim 1 is characterized in that, aforementioned EL fluorophor particle has the damp proof tunicle that forms on its surface.
6. the manufacture method of illuminated switch, it possesses the manufacturing process of EL sheet material and the manufacturing process of illuminated switch, it is characterized in that,
The manufacturing process of described EL sheet material is the manufacturing process with EL sheet material of illuminating part pattern, possesses:
On the surface with transparent protective film of the thickness below the 60 μ m more than the 10 μ m, corresponding aforementioned illuminating part forms the operation of the transparent electrode layer that is formed by electric conductive polymer,
Form the operation of the distribution of powering more than 2 covers that land used is connected with the 2nd power supply terminal respectively that connect the aforementioned transparent electrode layer corresponding with aforementioned illuminating part pattern,
On aforementioned transparent electrode layer, corresponding aforementioned illuminating part pattern, formation has the operation that dispersion is contained in the luminescent layer of the EL fluorophor particle in the dielectric matrix,
On aforementioned light emission layer, corresponding aforementioned illuminating part pattern, the operation of formation dielectric layer,
On aforementioned transparent protective film with aforementioned transparent electrode layer, aforementioned light emission layer and aforementioned electric dielectric layer; formation have a plurality of electrode part corresponding with aforementioned illuminating part pattern and connect the backplate layer that can separately make the above power supply of the 2 covers distribution that land used is connected with the 1st power supply terminal respectively between aforementioned a plurality of electrode part operation and
On aforementioned backplate layer, form the operation of back side insulating barrier;
The manufacturing process of described illuminated switch comprises:
In a plurality of switching mechanism portions with make the aforementioned EL sheet material of configuration between a plurality of key head portion of aforementioned a plurality of switching mechanism portion action, make aforementioned illuminating part pattern corresponding with aforementioned a plurality of key head portion.
7. the manufacture method of illuminated switch as claimed in claim 6, it is characterized in that, portion of aforementioned switches mechanism has by the travelling contact of of bonding and is configured in fixed contact on the substrate, and aforementioned travelling contact and aforementioned fixation contact are corresponding to the previous key header arrangement.
8. the manufacture method of illuminated switch as claimed in claim 6 is characterized in that, the pad of the softness that the surface of aforementioned EL sheet material and at least one side's at the back side the position configuration polyurethane resin corresponding with illuminating part central authorities forms.
9. the manufacture method of illuminated switch as claimed in claim 6 is characterized in that, aforementioned EL fluorophor particle is that the EL fluorophor forms by ZnS.
10. the manufacture method of illuminated switch as claimed in claim 6 is characterized in that, aforementioned EL fluorophor particle has the damp proof tunicle that forms on its surface.
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US20070177370A1 (en) 2007-08-02

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